I have a 1TB G-Drive w/Thunderbolt 2 and USB 3.0, it’s exactly 3 years old. I bought it to transfer work between my Mac mini (2012) and MacBook Pro (2013). When new I tested the speeds at about 130MBps with either USB 3 or TBolt 2 on either machine (using BlackMagic Disk Speed Test).
A few weeks ago I bought a Mac Mini 2018 and hooked up the G-Drive with a USB-C to Micro-B cable, it worked fine, but when I ran BlackMagic it’s best speed was in the low 80’s, it was the same using a USB 3.0 cable. I then went back and tested the MacBook and older mini with both T-Bolt and USB 3.0 and got the same results. So I can safely say the drive has slowed down about 40%. My internal SSD and spinning drives are running at roughly the same speed as before.
Of course the drive has slowly filled up, and is currently at around 600GB, or 60% full. Its never been full and then emptied, just more files added over time. I’ve also never run any kind of maintenance utility as I’ve generally understood that with MacOS it isn’t needed or recommended (the drive is formatted MacOS Extended (Journaled).
So, is this considered ‘normal’? It doesn’t seem to me that the drive is too full for good performance, and it’s not like it starts spinning slower, what’s up? Is there something I can do to get the G-Drive back up to snuff? Is there something I should be doing to keep it in top shape?
Thanks for your help!